What Is FT8?

FT8 (Franke-Taylor design, 8-FSK modulation) is a digital weak-signal communication mode developed by Joe Taylor (K1JT) and Steve Franke (K9AN). Released in 2017, it rapidly became one of the most widely used modes in amateur radio — and for good reason.

FT8 is designed to decode signals that are far too weak to be heard by the human ear. This makes it remarkably effective for long-distance (DX) contacts with modest power and simple antennas. A 10-watt station running FT8 from an apartment can work countries that would be impossible on SSB.

How FT8 Works

FT8 operates in strict 15-second transmission intervals. Your software automatically synchronizes to these intervals using your computer's clock. Each transmission carries a compact, structured message — typically including call signs, a grid square locator, and a signal report. The entire exchange (a complete QSO) takes about 90 seconds.

Because the messages are so short and structured, the software can decode signals that are 20–25 dB below the noise floor — signals you'd never hear on a speaker. This is the key to FT8's effectiveness.

What You Need to Get Started

Hardware

  • HF transceiver with SSB capability (any modern HF rig works)
  • Computer interface — connects your radio's audio to your PC. Options range from simple VOX-triggered cables to dedicated interfaces like the Signalink USB or RigBlaster.
  • A computer running Windows, macOS, or Linux
  • An antenna and feedline (even a simple wire antenna works well for FT8)

Software

The primary software for FT8 is WSJT-X, developed by the same team that created the mode. It's free and open-source. Download it from physics.princeton.edu/pulsar/k1jt/wsjtx.html.

You'll also want:

  • GridTracker — A companion app that maps your contacts in real time on a world map
  • JTAlert — Provides audio and visual alerts for new entities, states, or grid squares being heard
  • A reliable internet time sync (W32tm or similar) to keep your computer clock accurate to within ±1 second

Setting Up WSJT-X

  1. Configure your radio connection — Enter your transceiver model, COM port for CAT control, and audio device settings in WSJT-X's configuration menu.
  2. Enter your call sign and grid square — Your 6-character Maidenhead grid square locator is used in FT8 exchanges (e.g., EM69).
  3. Sync your computer clock — This is critical. FT8 will not decode correctly if your clock is off by more than a second.
  4. Set your audio levels — The waterfall display in WSJT-X should show a clean, flat noise floor with signal traces visible. Adjust your radio's audio output so the WSJT-X audio meter reads around 50–70% without peaking.

Making Your First FT8 Contact

Tune to a common FT8 frequency (20 meters: 14.074 MHz USB is the most active), watch the waterfall fill with signal traces, and observe the decoded messages scrolling in the left panel. When you're ready:

  1. Double-click a station's call sign in the decode list to initiate a contact
  2. WSJT-X will automatically generate and send the appropriate response messages
  3. The software manages the exchange sequence for you — you just need to confirm each step
  4. At the end, log the contact and optionally upload it to Logbook of the World (LoTW) for award credit

FT8 Etiquette and Best Practices

  • Don't transmit on a frequency already occupied by another signal on the waterfall
  • Keep your transmit audio at proper levels — over-driven FT8 causes broad, splatter-like signals that interfere with nearby stations
  • Upload your logs to LoTW and QRZ.com to help others confirm contacts for awards
  • FT8 is great for DX and award-chasing, but explore other digital modes (JS8Call, Winlink, PSK31) for more conversational exchanges

FT8 has lowered the barrier to DX for millions of operators. If you haven't tried it yet, you're missing one of the most exciting developments in amateur radio in decades.